American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 106)

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Service
Troubleshooting Hints
c. If a fuse is open, replace it with a 2.5A IEC 127-2 Type F Sheet
II 5x20mm fuse.
d. Check your connected equipment for compliance with the
output receptacle rating.
Caution
Installing fuses of incorrect values and ratings could result in
damage to the instrument in the event of component failure.
2. Replace the fuse(s) if needed and securely fasten the instrument
top cover. Reconnect the power-cord.
6.2.9 The Model 286 does not remember the alarm setpoints after
power is removed
Contact an Authorized AMI Support Representative. This condition
indicates failure of the non-volatile memory internal to the
microprocessor.
6.2.10 The Model 286 is not responding to remote communications
commands
1. Verify your communications cable integrity and wiring. See the
Appendix for RS-232/422 connector pinouts.
2. Check to make sure you are sending the correct termination
characters to the instrument. If you are using the RS-232 or the
RS-422 option, make sure the baud rate, number of stop bits, and
data bits/parity settings match.
3. Check your host communications software and make sure it is
recognizing the return termination characters from the instrument.
For RS-232 communication, the return termination characters are
.
4. If the instrument is responding repeatedly with errors, try a device
clear command (DCL) or powering the instrument off and then
back on. Be sure you are sending valid commands.
6.3 Modifying the Line Voltage Input Range
Warning
Before removing the cover of the instrument, remove the power from
the instrument by disconnecting the power cord from the power